How severe is CVE-2026-34917?

CVE-2026-34917 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-34917 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-34917?

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

Does CVE-2026-34917 have an EU (EUVD) identifier?

Yes. CVE-2026-34917 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38509.

When was CVE-2026-34917 published?

CVE-2026-34917 was published on 2026-06-23 and last updated on 2026-06-25.

CVE-2026-34917

CVE-2026-34917 is a medium-severity vulnerability with a CVSS 3.x base score of 4.3. 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-287.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38509
Weakness: CWE-287
Published: 2026-06-23
Last modified: 2026-06-25

Description

Low‑privileged session IDs generated for the web admin console could be reused in the XML‑RPC API, whose authentication is normally restricted to admin users. An attacker could leverage this to gain unauthorised access and exploit API‑level vulnerabilities. The session context (web/API) is now recorded along with other session data, preventing session IDs from being used interchangeably.

Frequently asked questions

What is CVE-2026-34917?: Low‑privileged session IDs generated for the web admin console could be reused in the XML‑RPC API, whose authentication is normally restricted to admin users. An attacker could leverage this to gain unauthorised access and exploit API‑level vulnerabilities. The session context (web/API) is now recorded along with other session data, preventing session IDs from being used interchangeably.
How severe is CVE-2026-34917?: CVE-2026-34917 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-34917 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-34917?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34917 have an EU (EUVD) identifier?: Yes. CVE-2026-34917 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38509.
When was CVE-2026-34917 published?: CVE-2026-34917 was published on 2026-06-23 and last updated on 2026-06-25.

References

https://hackerone.com/reports/3672641

Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

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