How severe is CVE-2026-34598?

CVE-2026-34598 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-34598 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34598?

CVE-2026-34598 affects Yeswiki. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34598?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34598 have an EU (EUVD) identifier?

Yes. CVE-2026-34598 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18458.

When was CVE-2026-34598 published?

CVE-2026-34598 was published on 2026-04-02 and last updated on 2026-06-17.

CVE-2026-34598

CVE-2026-34598 is a medium-severity vulnerability in Yeswiki with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 7.1
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18458
Weakness: CWE-79
Affected product: Yeswiki
Published: 2026-04-02
Last modified: 2026-06-17

Description

YesWiki is a wiki system written in PHP. Prior to version 4.6.0, a stored and blind XSS vulnerability exists in the form title field. A malicious attacker can inject JavaScript without any authentication via a form title that is saved in the backend database. When any user visits that injected page, the JavaScript payload gets executed. This issue has been patched in version 4.6.0.

Frequently asked questions

What is CVE-2026-34598?: YesWiki is a wiki system written in PHP. Prior to version 4.6.0, a stored and blind XSS vulnerability exists in the form title field. A malicious attacker can inject JavaScript without any authentication via a form title that is saved in the backend database. When any user visits that injected page, the JavaScript payload gets executed. This issue has been patched in version 4.6.0.
How severe is CVE-2026-34598?: CVE-2026-34598 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-34598 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34598?: CVE-2026-34598 affects Yeswiki. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34598?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34598 have an EU (EUVD) identifier?: Yes. CVE-2026-34598 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18458.
When was CVE-2026-34598 published?: CVE-2026-34598 was published on 2026-04-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:yeswiki:yeswiki:*:*:*:*:*:*:*:*

More vulnerabilities in Yeswiki

CVE-2025-46348 — Critical (CVSS 10.0): YesWiki is a wiki system written in PHP. Prior to version 4.5.4, the request to commence a site backup can be performed…
CVE-2024-51478 — Critical (CVSS 9.9): YesWiki is a wiki system written in PHP. Prior to 4.4.5, the use of a weak cryptographic algorithm and a hard-coded…
CVE-2025-46347 — Critical (CVSS 9.8): YesWiki is a wiki system written in PHP. Prior to version 4.5.4, YesWiki vulnerable to remote code execution. An…
CVE-2018-1000641 — Critical (CVSS 9.8): YesWiki version <= cercopitheque beta 1 contains a PHP Object Injection vulnerability in Unserialising user entered…
CVE-2025-31131 — High (CVSS 8.6): YesWiki is a wiki system written in PHP. The squelette parameter is vulnerable to path traversal attacks, enabling read…
CVE-2025-46349 — High (CVSS 7.6): YesWiki is a wiki system written in PHP. Prior to version 4.5.4, YesWiki is vulnerable to reflected XSS in the file…

All CVEs affecting Yeswiki →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →