CVE-2023-46734 — Symfony is a PHP framework for web and console applications and a set of reusabl
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Starting in versions 2.0.0, 5.0.0, and 6.0.0 and prior to versions 4.4.51, 5.4.31, and 6.3.8, some Twig filters in CodeExtension use `is_safe=html` but don't actually ensure the
Published
2023-11-10T18:15:09.360
Last modified
2026-07-29T18:36:47.633
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
01What is this vulnerability?
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Starting in versions 2.0.0, 5.0.0, and 6.0.0 and prior to versions 4.4.51, 5.4.31, and 6.3.8, some Twig filters in CodeExtension use `is_safe=html` but don't actually ensure their input is safe. As of versions 4.4.51, 5.4.31, and 6.3.8, Symfony now escapes the output of the affected filters.
02Affected products
No structured affected-product list available — see references below for vendor advisories.
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2023-11-10T18:15:09.360
- Last modified: 2026-07-29T18:36:47.633
09References
- github.com — https://github.com/symfony/symfony/commit/5d095d5feb1322b16450284a04d6bb48d1198f…
- github.com — https://github.com/symfony/symfony/commit/9da9a145ce57e4585031ad4bee37c497353eec…
- github.com — https://github.com/symfony/symfony/security/advisories/GHSA-q847-2q57-wmr3
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/11/msg00019.html
- github.com — https://github.com/symfony/symfony/commit/5d095d5feb1322b16450284a04d6bb48d1198f…
- github.com — https://github.com/symfony/symfony/commit/9da9a145ce57e4585031ad4bee37c497353eec…
- github.com — https://github.com/symfony/symfony/security/advisories/GHSA-q847-2q57-wmr3
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/11/msg00019.html
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