CVE-2026-45753
unknown
CVSS v3
—
CVSS v4 NEW
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VIR risk
—
Description
Symfony's HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite — `javascript`: URI Survives Sanitization (XSS)
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.4.41+dfsg-0+deb13u1 |
| sid | Fixed | 7.4.12+dfsg-1 |
| forky | Fixed | 7.4.12+dfsg-1 |
| bullseye | Fixed | 0 |
| bookworm | Fixed | 0 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Packagist | symfony/html-sanitizer | >=6.1.0,<6.2.0|>=6.2.0,<6.3.0|>=6.3.0,<6.4.0|>=6.4.0,<6.4.40|>=7.0.0,<7.1.0|>=7.1.0,<7.2.0|>=7.2.0,<7.3.0|>=7.3.0,<7.4.0|>=7.4.0,<7.4.12|>=8.0.0,<8.0.12 | |
| Packagist | symfony/symfony | >=6.1.0,<6.2.0|>=6.2.0,<6.3.0|>=6.3.0,<6.4.0|>=6.4.0,<6.4.40|>=7.0.0,<7.1.0|>=7.1.0,<7.2.0|>=7.2.0,<7.3.0|>=7.3.0,<7.4.0|>=7.4.0,<7.4.12|>=8.0.0,<8.0.12 | |
| Packagist | symfony/html-sanitizer | >=6.1.0,<6.4.40 | 6.4.40 |
| Packagist | symfony/html-sanitizer | >=7.0.0,<7.4.12 | 7.4.12 |
| Packagist | symfony/html-sanitizer | >=8.0.0,<8.0.12 | 8.0.12 |
| Packagist | symfony/symfony | >=6.1.0,<6.4.40 | 6.4.40 |
| Packagist | symfony/symfony | >=7.0.0,<7.4.12 | 7.4.12 |
| Packagist | symfony/symfony | >=8.0.0,<8.0.12 | 8.0.12 |
References
- https://symfony.com/cve-2026-45753
- https://security-tracker.debian.org/tracker/CVE-2026-45753
- https://github.com/symfony/symfony/security/advisories/GHSA-hhg7-c65m-h7ff
- https://github.com/symfony/symfony/commit/26a598fcfc4f903cc55ff202f642ee621839825e
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/html-sanitizer/CVE-2026-45753.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45753.yaml
- https://github.com/symfony/symfony
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.