{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-20355 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-20355 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-20355 is a medium-severity vulnerability in Cisco Secure Email, published on 2 Sep 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-2026-20355 and fix it if it is affected.\n\nWhat it is: CVE-2026-20355 is a medium-severity vulnerability in Cisco Secure Email, published on 2 Sep 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-2026-20355 in the wild and no public exploit code.\n\nAffected product: Cisco Secure Email. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-20355/ (Markdown: https://insights.sbomify.com/CVE-2026-20355/index.md)","id":"CVE-2026-20355","markdown":"https://insights.sbomify.com/CVE-2026-20355/index.md","name":"CVE-2026-20355","record":{"aliases":["GHSA-4rjc-g85j-x387"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Secure Email Gateway","requires_auth":"none","summary":"An attacker can recover plaintext from encrypted emails via MITM attacks due to insufficient integrity validation in Cisco Secure Email.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"cisco","cpe":[],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-345","name":"Insufficient Verification of Data Authenticity"}],"description":"Multiple vulnerabilities in the Secure/Multipurpose Internet Mail Extensions (S/MIME) decryption functionality of Cisco Secure Email could allow an unauthenticated, remote attacker to recover plain text from encrypted email messages.\r\n\r\nThese vulnerabilities are due to insufficient validation of message integrity. An attacker could exploit these vulnerabilities by using a machine-in-the-middle technique to intercept and modify traffic between email gateways. A successful exploit could allow the attacker to obtain plaintext content from the encrypted communication.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Cisco Secure Email S/MIME Ciphertext Decryption Vulnerabilty","id":"CVE-2026-20355","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"other","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Multiple Cisco Products Snort 3 Software Hardening Release: October 2026","id":"CVE-2026-20356"},"packages":[],"prev":{"headline":"Cisco Secure Email S/MIME Ciphertext Decryption Vulnerabilty","id":"CVE-2026-20354"},"products":["Cisco Secure Email"],"published":"2026-09-02","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-09-08","vendors":["Cisco"]},"summary":"An attacker can recover plaintext from encrypted emails via MITM attacks due to insufficient integrity validation in Cisco Secure Email.","url":"https://insights.sbomify.com/CVE-2026-20355/"}