VulnSocial

CVE-2026-5389Disclosure

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 before 1.13.0 contain a cross-site scripting vulnerability in the to_markdown() function when serializing attacker-controlled pre content. Attackers can place backticks inside sanitized pre elements to break out of fixed-length code fences, allowing raw HTML to execute when the generated Markdown is rendered by CommonMark or GFM-style renderers.

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0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-80

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-2026-5389 justhtml versions before 1.13.0 contain a cross-site scripting vulnerability in the to_markdown() function when serializing attacker-controlled pre content. Attackers c… https://www.cve.org/CVERecord?id=CVE-2026-5389 ----- Traducción: CVE-2026-5389 las… http://infoflow.cloud`

    Post summary

    The post announces CVE-2026-5389: a C‑XSS vulnerability in justhtml prior to version 1.13.0, detected via the to_markdown() function, with no PoC, exploit, or patch details shared.

    0000024
    102 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-5389 justhtml versions before 1.13.0 contain a cross-site scripting vulnerability in the to_markdown() function when serializing attacker-controlled pre content. Attackers c… https://www.cve.org/CVERecord?id=CVE-2026-5389

    Post summary

    The tweet discloses a cross‑site scripting vulnerability in justhtml versions before 1.13.0, but lacks details on PoC, exploitation tools, active attacks, or mitigations.

    000001.6K
    58.0K followersView on X

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