VulnSocial

CVE-2026-4125Disclosure

LOWCVSS 6.4 · 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 WPMK Block plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'class' shortcode attribute in all versions up to and including 1.0.1. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes. Specifically, in the wpmk_block_shortcode() function, the 'class' attribute is extracted from user-controllable shortcode attributes and directly concatenated into an HTML div element's class attribute without any escaping (e.g., esc_attr()). This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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1.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-79

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 · 2026-04-25: 1PoC Mentioned / Linked · 2026-04-25: 1Technical Details · 2026-04-23: 104-2304-25
Signal classification2 categories
Disclosure
150.0%
PoC
150.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-04-231
Disclosure1
2026-04-251
PoC1
Full discourse2 posts
  • Atomic Edge@atomicedgeWAF
    PoC

    https://atomicedge.io/cve-proof/cve-2026-4125-wpmk-block-version-1-0-1-medium-vulnerability-proof-of-concept CVE-2026-4125 #WordPress plugin #vulnerability wpmk-block #cybersecurity #wordpressfirewall #wordpresssecurity #hacking #wpsecurity #atomicedge

    Post summary

    The post shares a direct link to a proof‑of‑concept for CVE‑2026‑4125, indicating that a PoC exists, but it does not provide functional exploit details, active‑use evidence, or remediation guidance.

    0000041
    6 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-4125 The WPMK Block plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'class' shortcode attribute in all versions up to and including 1.0.1. This is … https://www.cve.org/CVERecord?id=CVE-2026-4125

    Post summary

    The text announces a stored XSS vulnerability in the WPMK Block plugin via the class attribute for all versions up to 1.0.1, citing the CVE record but providing no PoC, exploit, or patch details.

    00000116
    57.2K followersView on X

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