VulnSocial

CVE-2026-5751Disclosure

LOWCVSS 5.1 · MEDIUM

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

justhtml versions 1.13.0 and earlier contain a parser-differential / mutation cross-site scripting (mXSS) vulnerability when using a custom SanitizationPolicy that preserves foreign namespaces (e.g., drop_foreign_namespaces=False with allowlisted SVG/MathML elements or raw-text containers such as <style>). Specially crafted input can sanitize into markup that appears safe but becomes unsafe when re-parsed by a browser or another HTML parser, allowing markup injection. The default safe configuration (sanitize=True) is not affected. Fixed in 1.14.0.

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0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-79

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

  • 2 mentions across 1 observed day

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • 2 total mentions across 1 day

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-08-23: 2Technical Details · 2026-08-23: 208-23
Signal classification1 categories
Disclosure
2100.0%
Referenced assets2 URLs
By indicator
Full discourse2 posts
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-5751 justhtml versions 1.13.0 and earlier contain a parser-differential / mutation cross-site scripting (mXSS) vulnerability when using a custom SanitizationPolicy that pres… https://www.cve.org/CVERecord?id=CVE-2026-5751 ----- Traducción: CVE-2026-5751 las… http://infoflow.cloud`

    Post summary

    CVE‑2026‑5751 affects justhtml up to version 1.13.0, exposing a parser‑differential / mutation XSS vulnerability when custom SanitizationPolicy is used. No PoC, exploit, patch, or active exploitation info is provided.

    0000016
    102 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-5751 justhtml versions 1.13.0 and earlier contain a parser-differential / mutation cross-site scripting (mXSS) vulnerability when using a custom SanitizationPolicy that pres… https://www.cve.org/CVERecord?id=CVE-2026-5751

    Post summary

    The tweet announces a parser‑differential/mutation XSS vulnerability in justhtml 1.13.0 and earlier that is triggered by custom sanitization policies.

    00000985
    58.0K followersView on X

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