VulnSocial

CVE-2026-2717Disclosure

LOWCVSS 5.5 · MEDIUM

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

  • 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

The HTTP Headers plugin for WordPress is vulnerable to CRLF Injection in all versions up to, and including, 1.19.2. This is due to insufficient sanitization of custom header name and value fields before writing them to the Apache .htaccess file via `insert_with_markers()`. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary newline characters and additional Apache directives into the .htaccess configuration file via the 'Custom Headers' settings, leading to Apache configuration parse errors and potential site-wide denial of service.

Back to dashboard
1.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-93

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

STABLE

Threat summary

  • Public PoC is present in monitored signal
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • PoC mentioned or linked in 1 signal
  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-04-23); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-04-23: 1Mentions · 2026-04-24: 1PoC Mentioned / Linked · 2026-04-24: 1Technical Details · 2026-04-23: 104-2304-24
Signal classification2 categories
Disclosure
150.0%
PoC
150.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-04-231
Disclosure1
2026-04-241
PoC1
Full discourse2 posts
  • Atomic Edge@atomicedgeWAF
    PoC

    https://atomicedge.io/cve-proof/cve-2026-2717-http-headers-version-1-19-2-medium-vulnerability-proof-of-concept CVE-2026-2717 #WordPress plugin #vulnerability http-headers #cybersecurity #wordpressfirewall #wordpresssecurity #hacking #wpsecurity #atomicedge

    Post summary

    The post provides a proof‑of‑concept for CVE‑2026‑2717, a medium‑severity vulnerability in the WordPress Http‑Headers plugin, but offers no exploitation details, patches, or evidence of active use.

    0000065
    6 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-2717 The HTTP Headers plugin for WordPress is vulnerable to CRLF Injection in all versions up to, and including, 1.19.2. This is due to insufficient sanitization of custom h… https://www.cve.org/CVERecord?id=CVE-2026-2717

    Post summary

    The HTTP Headers plugin for WordPress is vulnerable to CRLF injection in all versions through 1.19.2, but no PoC, exploit, or patch details are provided in the text.

    00000126
    57.2K followersView on X

Explore more

Back to dashboard