symfony/http-kernel security advisory

CVE-2026-45075: HEAD Request Bypasses methods: ['GET'] Filter in #[IsGranted] / #[IsSignatureValid] / #[IsCsrfTokenValid] in symfony/http-kernel

CVE-2026-45075 is a high-severity missing authorization vulnerability in the PHP package symfony/http-kernel (CVSS 8.2), published 14 July 2026. It is fixed in 7.4.12 and 8.0.12, one per release line; earlier versions on each line are affected. It can be exploited without an account.

high 8.2 published 2026-07-14 · updated 2026-07-16

Affected versions: >= 7.4.0, < 7.4.12
>= 8.0.0, < 8.0.12
Fixed in: 7.4.12, 8.0.12
Newest release: 8.1.10
Severity: High · CVSS 8.2
Type: Missing authorization check
CWE-863
Exploited in the wild: Not on the CISA KEV list
checked 2026-11-04

Also affects

The same advisory covers other packages in our list. Fix whichever one your project installs.

symfony/security-http >= 7.4.0, < 7.4.12; >= 8.0.0, < 8.0.12 fixed in 7.4.12, 8.0.12
symfony/symfony >= 7.4.0, < 7.4.12; >= 8.0.0, < 8.0.12 fixed in 7.4.12, 8.0.12

Is your symfony/http-kernel version affected?

Run composer show symfony/http-kernel in your project, then enter the version. We check it against this and every other known symfony/http-kernel advisory.

Who can exploit CVE-2026-45075

Access: No account. Anyone who can send a request to an app that uses the affected code.

CVSS vector (scored by NVD): CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Your app is only exposed if it uses the affected part of symfony/http-kernel. The advisory below says which part that is. If you are not sure, upgrade anyway: it costs less than finding out.

How to fix CVE-2026-45075 in symfony/http-kernel

Find the installed version: composer show symfony/http-kernel. If you never required it yourself, composer why symfony/http-kernel shows which package pulls it in.
Update it: composer update symfony/http-kernel --with-all-dependencies. You need the fixed version for your release line (7.4.12 and 8.0.12).
If Composer will not go that high, your composer.json constraint is holding it back. Widen it (for example "symfony/http-kernel": "^8.0.12" if you can take that version), or upgrade the package that requires it.
Run composer audit. It reads the same advisory data and should no longer list CVE-2026-45075.
Commit composer.lock and deploy it. On the server, run composer install --no-dev from the lock file, not composer update.

If you cannot upgrade yet

General hardening for missing authorization issues while the upgrade waits. None of it replaces the fix.

Remove accounts you do not need and review what each role can do.
Put the admin area behind a VPN, IP allow-list or extra login until you upgrade.
If your app does not use the affected feature, note that in your audit, but still plan the upgrade.

The CVE-2026-45075 advisory

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.12 and 8.0.12, method-scoped #[IsGranted], #[IsSignatureValid], and #[IsCsrfTokenValid] attributes can be configured for GET only, but Symfony routes HEAD requests to the GET handler while the attribute check is skipped, allowing protected controllers to execute and leak headers or perform side effects. This issue is fixed in versions 7.4.12 and 8.0.12.

Description from the CVE record, published by GitHub (the CVE Numbering Authority), via the NVD entry for CVE-2026-45075. Advisory title: “CVE-2026-45075: HEAD Request Bypasses methods: ['GET'] Filter in #[IsGranted] / #[IsSignatureValid] / #[IsCsrfTokenValid]”.

References

GitHub security advisory GHSA-6439-2f28-8p8q github.com
Symfony security advisory symfony.com
Release v7.4.12 github.com
Release v8.0.12 github.com

Other symfony/http-kernel advisories

medium CVE-2022-24894: Prevent storing cookie headers in HttpCache 2023-02-01
medium CVE-2021-41267: Webcache Poisoning via X-Forwarded-Prefix and sub-request 2021-10-09
high CVE-2020-15094: Prevent RCE when calling untrusted remote with CachingHttpClient 2020-09-02
high CVE-2019-18887: Use constant time comparison in UriSigner 2019-11-13
medium CVE-2015-4050: ESI unauthorized access 2015-05-26
medium CVE-2015-2308: Esi Code Injection 2015-04-01

Need help patching or upgrading? Laskyr does PHP and Laravel security fixes and upgrades. Tell us what you run and we reply with a plan and a price.

Ask about a fix

Where this data comes from

Affected and fixed versions: the Packagist security advisories API (GitHub Advisory Database and FriendsOfPHP), the same data composer audit uses. Synced 2026-11-03.
Description, score, weakness and references: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
Exploited-in-the-wild status: the CISA Known Exploited Vulnerabilities catalog, checked 2026-11-04.
Compiled by Daniel Lasek at Laskyr from the sources above. The summary, “who can exploit it”, “how to fix it” and hardening sections are our plain-English reading of the record and are generated from it. The quoted description is the record's own text. Spot an error? Tell us.