{"answers":{"affected":"8 open source packages ship an affected version, including symfony/mailomat-mailer and symfony/symfony. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-48747 in the wild and no public exploit code.","fix":"Upgrade symfony/mailomat-mailer to a fixed version for your release line: 7.4.13 or 8.0.13.","what":"CVE-2026-48747 is a medium-severity vulnerability in Sensiolabs Symfony, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-48747 and fix it if it is affected.\n\nWhat it is: CVE-2026-48747 is a medium-severity vulnerability in Sensiolabs Symfony, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-48747 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- symfony/mailomat-mailer (Packagist): affected from 7.2.0; fixed in 7.4.13\n- symfony/mailomat-mailer (Packagist): affected from 7.2.0; fixed in 7.4.13\n- symfony/mailomat-mailer (Packagist): affected from 8.0.0; fixed in 8.0.13\n- symfony/mailomat-mailer (Packagist): affected from 8.0.0; fixed in 8.0.13\n- symfony/symfony (Packagist): affected from 7.2.0; fixed in 7.4.13\n- symfony/symfony (Packagist): affected from 7.2.0; fixed in 7.4.13\n- symfony/symfony (Packagist): affected from 8.0.0; fixed in 8.0.13\n- symfony/symfony (Packagist): affected from 8.0.0; fixed in 8.0.13\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-48747/ (Markdown: https://insights.sbomify.com/CVE-2026-48747/index.md)","id":"CVE-2026-48747","markdown":"https://insights.sbomify.com/CVE-2026-48747/index.md","name":"CVE-2026-48747","record":{"aliases":["DEBIAN-CVE-2026-48747","GHSA-rrj9-5q2j-4gvr","UBUNTU-CVE-2026-48747"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Symfony Mailomat Mailer","requires_auth":"none","summary":"Attackers can bypass webhook signature verification by downgrading the HMAC algorithm, allowing unauthorized webhook requests in Symfony Mailomat Mailer.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"symfony","vendor":"sensiolabs"}],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-757","name":"Selection of Less-Secure Algorithm During Negotiation"},{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"}],"description":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.13 and 8.0.13, MailomatRequestParser::validateSignature() parsed X-MOM-Webhook-Signature as algo=signature and passed the request-selected algorithm to hash_hmac(), allowing a signature algorithm downgrade instead of enforcing Mailomat's documented SHA-256 webhook signature. This issue is fixed in versions 7.4.13 and 8.0.13.","ecosystems":["Packagist"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade","id":"CVE-2026-48747","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":"sensiolabs:symfony","products":["sensiolabs:symfony"],"type":"security_feature_bypass","year":"2026"},"n_packages":8,"n_references":4,"next":{"headline":"Netty HTTP/3 QPACK Blocked Streams Memory Exhaustion","id":"CVE-2026-48748"},"packages":[{"ecosystem":"Packagist","fixed":["7.4.13"],"introduced":["7.2.0"],"last_affected":[],"package":"symfony/mailomat-mailer","purl":null,"source":"GHSA-rrj9-5q2j-4gvr"},{"ecosystem":"Packagist","fixed":["7.4.13"],"introduced":["7.2.0"],"last_affected":[],"package":"symfony/mailomat-mailer","purl":"pkg:composer/symfony/mailomat-mailer","source":"GHSA-rrj9-5q2j-4gvr"},{"ecosystem":"Packagist","fixed":["8.0.13"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/mailomat-mailer","purl":null,"source":"GHSA-rrj9-5q2j-4gvr"},{"ecosystem":"Packagist","fixed":["8.0.13"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/mailomat-mailer","purl":"pkg:composer/symfony/mailomat-mailer","source":"GHSA-rrj9-5q2j-4gvr"},{"ecosystem":"Packagist","fixed":["7.4.13"],"introduced":["7.2.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-rrj9-5q2j-4gvr"},{"ecosystem":"Packagist","fixed":["7.4.13"],"introduced":["7.2.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-rrj9-5q2j-4gvr"},{"ecosystem":"Packagist","fixed":["8.0.13"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/symfony","purl":null,"source":"GHSA-rrj9-5q2j-4gvr"},{"ecosystem":"Packagist","fixed":["8.0.13"],"introduced":["8.0.0"],"last_affected":[],"package":"symfony/symfony","purl":"pkg:composer/symfony/symfony","source":"GHSA-rrj9-5q2j-4gvr"}],"prev":{"headline":"vLLM: OpenAI auth bypass","id":"CVE-2026-48746"},"products":["mailomat-mailer","symfony"],"published":"2026-07-14","related":[{"cvss_score":9.8,"headline":"Improper Input Validation in Symfony","id":"CVE-2019-11325","kev_date_added":null,"published":"2019-11-21"},{"cvss_score":9.8,"headline":"Symfony Incorrect Access Control","id":"CVE-2017-11365","kev_date_added":null,"published":"2019-05-23"},{"cvss_score":9.8,"headline":"Invalid HTTP method overrides allow possible XSS or other attacks in Symfony","id":"CVE-2019-10913","kev_date_added":null,"published":"2019-05-16"},{"cvss_score":9.8,"headline":"Symfony Authentication Bypass","id":"CVE-2018-11407","kev_date_added":null,"published":"2018-06-13"},{"cvss_score":9.8,"headline":"Symfony Authentication Bypass","id":"CVE-2016-2403","kev_date_added":null,"published":"2017-02-07"},{"cvss_score":9.1,"headline":"Symfony: Identity Spoofing via Unanchored DN Regex in X509Authenticator","id":"CVE-2026-45063","kev_date_added":null,"published":"2026-07-14"},{"cvss_score":8.8,"headline":"Symfony: OidcTokenHandler Accepts JWTs Missing aud/iss/exp Claims","id":"CVE-2026-45069","kev_date_added":null,"published":"2026-07-14"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-15","vendors":["symfony"]},"summary":"Attackers can bypass webhook signature verification by downgrading the HMAC algorithm, allowing unauthorized webhook requests in Symfony Mailomat Mailer.","url":"https://insights.sbomify.com/CVE-2026-48747/"}