CVE-2026-17089Disclosure

LOWCVSS 6.1 · MEDIUM

Signal is active with 1 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

The Events Manager – Calendar, Bookings, Tickets, and more! plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'header_format' parameter in all versions up to, and including, 7.4.0.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. The shortcode entry point sanitizes 'header_format' via wp_kses(), but the unauthenticated 'search_events_grouped' AJAX action bypasses this sanitization entirely, leaving the parameter unsanitized before it is echoed into the HTML body in output_grouped().

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-79

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Threat summary

2 mentions across 2 observed days
Momentum state: stable

What's happening

Technical details provided in 2 signals
Disclosure: 2 classified signals
Peaked 1d ago at 1 mentions (2026-08-25); latest day: 1
2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d

Signal classification1 categories

Disclosure

2100.0%

Referenced assets2 URLs

By indicator

Full discourse2 posts

UNDERCODE TESTING@UndercodeUpdate17d
Disclosure
🚨 Mitigating #CVE-2026-17089: Securing WordPress Against Reflected XSS in the Events Manager Plugin + Video -Prediction: 📈 1 Positive | 📉 0 Negative https://undercodetesting.com/mitigating-cve-2026-17089-securing-wordpress-against-reflected-xss-in-the-events-manager-plugin-video/ Educational Purposes!
Post summary
The tweet announces the disclosure of CVE-2026-17089, a reflected XSS vulnerability affecting the WordPress Events Manager Plugin, and highlights mitigation guidance with an accompanying video.
0000041
752 followersView on X
Vulmon Vulnerability Feed@VulmonFeeds46d
Disclosure
CVE-2026-17089 Reflected XSS in Events Manager WordPress Plugin via Header Format Parameter https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-17089
Post summary
The note announces a reflected XSS vulnerability in the Events Manager WordPress plugin, describing its vector through a header format parameter.
00000112
4.1K followersView on X

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