{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-27890 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-27890 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-27890 is a high-severity SQL injection vulnerability in Mybb Mybb, published on 15 Mar 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-27890 and fix it if it is affected.\n\nWhat it is: CVE-2021-27890 is a high-severity SQL injection vulnerability in Mybb Mybb, published on 15 Mar 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-27890 in the wild and no public exploit code.\n\nAffected product: Mybb Mybb. 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-2021-27890/ (Markdown: https://insights.sbomify.com/CVE-2021-27890/index.md)","id":"CVE-2021-27890","markdown":"https://insights.sbomify.com/CVE-2021-27890/index.md","name":"CVE-2021-27890","record":{"aliases":[],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["data_read","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"MyBB forum software","requires_auth":"none","summary":"Attackers can execute arbitrary SQL commands via theme XML files, potentially reading or modifying database contents.","user_interaction":"required","vuln_class":"sql_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"mybb","vendor":"mybb"}],"cvss":{"score":8.8,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-89","name":"Improper Neutralization of Special Elements used in an SQL Command"}],"description":"SQL Injection vulnerablity in MyBB before 1.8.26 via theme properties included in theme XML files.","ecosystems":[],"exploits":{"exploitdb":1,"first_seen":"2021-03-22","github_poc":1,"max_poc_stars":10,"metasploit":0,"nuclei":0,"refs":[{"date":"2021-03-25T06:00:31Z","kind":"github_poc","ref":"https://github.com/xiaopan233/Mybb-XSS_SQL_RCE-POC","stars":10,"title":"Mybb associate CVE-2021-27890 \u0026 CVE-2021-27889 to RCE poc"},{"date":"2021-03-22","kind":"exploitdb","ref":"49696","stars":null,"title":"MyBB 1.8.25 - Chained Remote Command Execution"}],"tier":"poc_unverified"},"has_fix":null,"headline":"SQL injection in n/a","id":"CVE-2021-27890","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"mybb:mybb","products":["mybb:mybb"],"type":"sql_injection","year":"2021"},"n_packages":0,"n_references":3,"next":{"headline":"SSH Tectia Client and Server before 6.4.19 on Windows have weak key generation.","id":"CVE-2021-27891"},"packages":[],"prev":{"headline":"Cross-site scripting in n/a","id":"CVE-2021-27889"},"products":["n/a"],"published":"2021-03-15","related":[{"cvss_score":10,"headline":"myBB 1.6.4 Backdoor Arbitrary Command Execution","id":"CVE-2011-10018","kev_date_added":null,"published":"2025-08-13"},{"cvss_score":10,"headline":"Information disclosure in n/a","id":"CVE-2015-2786","kev_date_added":null,"published":"2015-03-29"},{"cvss_score":10,"headline":"Cross-site scripting in n/a","id":"CVE-2011-5133","kev_date_added":null,"published":"2012-08-30"},{"cvss_score":10,"headline":"SQL injection in n/a","id":"CVE-2006-0218","kev_date_added":null,"published":"2006-01-16"},{"cvss_score":9.8,"headline":"Code injection in n/a","id":"CVE-2020-22612","kev_date_added":null,"published":"2023-09-01"},{"cvss_score":9.8,"headline":"Code injection in n/a","id":"CVE-2017-16780","kev_date_added":null,"published":"2017-11-10"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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)"},{"class":"attribution","licence":"GPL-2.0-or-later","name":"Exploit-DB"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["n/a"]},"summary":"Attackers can execute arbitrary SQL commands via theme XML files, potentially reading or modifying database contents.","url":"https://insights.sbomify.com/CVE-2021-27890/"}