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PatchSiren cyber security CVE debrief

CVE-2026-46637 twigphp CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T22:16:56.410Z and has not been modified since then. Twig template language for PHP prior to version 3.26.0 has several filters in twig/markdown-extra and twig/cssinliner-extra registered with is_safe => [all], causing Twig to treat plain text or HTML output as safe in HTML, JavaScript, CSS, URL, and other contexts where the output is not properly escaped.

Vendor
twigphp
Product
Twig
CVSS
MEDIUM 5.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-16
Advisory published
2026-07-14
Advisory updated
2026-07-16

Who should care

Developers and administrators using Twig template language for PHP prior to version 3.26.0 should review and apply the security update to prevent potential XSS attacks. This includes reviewing affected product deployments, verifying vendor guidance, and implementing additional security measures.

Technical summary

Twig is a template language for PHP. Prior to 3.26.0, several filters in twig/markdown-extra and twig/cssinliner-extra are registered with is_safe => [all], causing Twig to treat plain text or HTML output as safe in HTML, JavaScript, CSS, URL, and other contexts where the output is not properly escaped. This issue is fixed in version 3.26.0. Affected deployments should review and apply the security update.

Defensive priority

Medium priority, as the vulnerability has a CVSS score of 5.1 and can lead to XSS attacks if not properly mitigated.

Recommended defensive actions

  • Review and apply the security update to Twig template language for PHP by upgrading to version 3.26.0 or later.
  • Verify that all filters in twig/markdown-extra and twig/cssinliner-extra are properly escaped and validated.
  • Implement additional security measures, such as input validation and output encoding, to prevent potential XSS attacks.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record was published on 2026-07-14T22:16:56.410Z and has not been modified since then. The NVD entry is currently Analyzed. The vulnerability has a CVSS score of 5.1 and a severity of MEDIUM. Evidence is limited to CVE and NVD details. Defenders should verify affected Twig deployments and review vendor guidance for mitigation.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T22:16:56.410Z and has not been modified since then.