VulnSocial

CVE-2026-34890Disclosure

LOWCVSS 6.5 · 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

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Mark O’Donnell MSTW League Manager allows DOM-Based XSS.This issue affects MSTW League Manager: from n/a through 2.10.

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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 (2026-04-02); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-04-02: 1Mentions · 2026-04-07: 1PoC Mentioned / Linked · 2026-04-07: 1Technical Details · 2026-04-02: 104-0204-07
Signal classification2 categories
Disclosure
150.0%
PoC
150.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-04-021
Disclosure1
2026-04-071
PoC1
Full discourse2 posts
  • Atomic Edge@atomicedgeWAF
    PoC

    https://atomicedge.io/cve-proof/cve-2026-34890-mstw-league-manager-version-2-10-medium-vulnerability-proof-of-concept CVE-2026-34890 #WordPress plugin #vulnerability mstw-league-manager #cybersecurity #wordpressfirewall #wordpresssecurity #hacking #wpsecurity #atomicedge

    Post summary

    The post shares a link to a proof‑of‑concept for CVE‑2026‑34890 affecting the mstw‑league‑manager WordPress plugin, without detailing exploitation, patches, or technical specifics.

    0000054
    6 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-34890 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Mark O’Donnell MSTW League Manager allows DOM-Based XSS.This iss… https://www.cve.org/CVERecord?id=CVE-2026-34890

    Post summary

    Announcement of a DOM‑based XSS vulnerability (CVE‑2026‑34890) affecting Mark O’Donnell MSTW League Manager, with technical details provided but no evidence of exploitation, PoC, or mitigation.

    00000142
    56.9K followersView on X

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