CVE-2026-42615Disclosure

LOWCVSS 7.2 · HIGH

Exploit discussion active in current signal (3 latest mentions)

Immediate actions

  • Prioritize remediation for affected systems immediately
  • Hunt for exploitation attempts and persistence artifacts
  • Increase monitoring for publicly documented tradecraft
  • Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.

3.5/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-79

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

NONE

Threat summary

  • Public PoC and exploit tooling are both present
  • 3 mentions across 1 observed day

What's happening

  • Exploit tool or code specified in 1 signal
  • PoC mentioned or linked in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • 3 total mentions across 1 day

Deep dive

Activity timeline3 mentions / 1d
01223Mentions · 2026-04-29: 3PoC Mentioned / Linked · 2026-04-29: 1Exploit Tool / Code · 2026-04-29: 1Technical Details · 2026-04-29: 204-29
Signal classification2 categories
Disclosure
266.7%
PoC
133.3%
Referenced assets3 URLs
Full discourse3 posts
  • CVEarity@CVEarity
    Disclosure

    ⚡ New CVE Alert: CVE-2026-42615 📊 Severity: 7.2 🚨 Risk Level: High 🧩 Affects: Multiple / Unspecified Products Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-42615 #CVE-2026-42615 #CVE #High #CyberSecurity #InfoSec https://t.co/LC0B359wHf

    Post summary

    The tweet announces CVE-2026-42615 with a severity of 7.2 and high risk level, but provides no technical or exploit details.

    0000042
    142 followersView on X
  • CVE@CVEnew
    PoC

    CVE-2026-42615 GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring. https://www.cve.org/CVERecord?id=CVE-2026-42615

    Post summary

    A PoC demonstrates an XSS flaw in GCHQ CyberChef before version 11.0.0 using a malicious recipe; the CVE is confirmed but no active exploitation or patch information is provided.

    00000130
    57.3K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-42615 Cross-Site Scripting in GCHQ CyberChef Before 11.0.0 via Show Base64 Offsets https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-42615

    Post summary

    CVE-2026-42615 announces a Cross‑Site Scripting vulnerability in GCHQ CyberChef versions prior to 11.0.0, triggered through the Show Base64 Offsets feature.

    0000044
    4.0K followersView on X

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