What is CVE-2026-48807?

CVE-2026-48807 is a critical-severity vulnerability in Symfony Twig, classified under Protection Mechanism Failure. CVSS score: 9.1/10. Published 2026-07-14.

How severe is CVE-2026-48807?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Symfony Twig

CVE-2026-48807

Twig is a template language for PHP. Prior to 3.27.0, the sandbox __toString() checks do not fully cover Traversable values passed to join and replace filters or operands evaluated by the in and not in operators, allowing contained Stringable objects to be coerced to strings without consulting the sandbox policy. This issue is fixed in version 3.27.0.

Published 2026-07-14 · last modified 2026-07-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (29.4th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Symfony Twig
Twigphp Twig — versions < 3.27.0

Weakness classification (CWE)

References

github.com/twigphp/Twig/security/advisories/GHSA-8x9c-rmqh-456c (Vendor Advisory)
github.com/twigphp/Twig/releases/tag/v3.27.0 (Release Notes)

Frequently asked questions

What is CVE-2026-48807?: CVE-2026-48807 is a critical-severity vulnerability in Symfony Twig, classified under Protection Mechanism Failure. CVSS score: 9.1/10. Published 2026-07-14.
How severe is CVE-2026-48807?: Critical severity. CVSS v3 base score is 9.1 out of 10.