How severe is CVE-2022-26138?

CVE-2022-26138 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-26138 being actively exploited?

Yes. CVE-2022-26138 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-07-29, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2022-26138?

CVE-2022-26138 primarily affects Atlassian Questions For Confluence. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-26138?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2022-26138 have an EU (EUVD) identifier?

Yes. CVE-2022-26138 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2022-30705. It is also flagged as exploited in the EUVD (since 2022-07-29).

When was CVE-2022-26138 published?

CVE-2022-26138 was published on 2022-07-20 and last updated on 2026-06-17.

CVE-2022-26138

CVE-2022-26138 is a critical-severity vulnerability in Atlassian Questions For Confluence with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-07-29). The underlying weakness is classified as CWE-798.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 98% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-07-29)
EU (EUVD) id: EUVD-2022-30705
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-07-29)
Weakness: CWE-798
Affected product: Atlassian Questions For Confluence
Published: 2022-07-20
Last modified: 2026-06-17

Description

The Atlassian Questions For Confluence app for Confluence Server and Data Center creates a Confluence user account in the confluence-users group with the username disabledsystemuser and a hardcoded password. A remote, unauthenticated attacker with knowledge of the hardcoded password could exploit this to log into Confluence and access all content accessible to users in the confluence-users group. This user account is created when installing versions 2.7.34, 2.7.35, and 3.0.2 of the app.

Frequently asked questions

What is CVE-2022-26138?: The Atlassian Questions For Confluence app for Confluence Server and Data Center creates a Confluence user account in the confluence-users group with the username disabledsystemuser and a hardcoded password. A remote, unauthenticated attacker with knowledge of the hardcoded password could exploit this to log into Confluence and access all content accessible to users in the confluence-users group. This user account is created when installing versions 2.7.34, 2.7.35, and 3.0.2 of the app.
How severe is CVE-2022-26138?: CVE-2022-26138 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2022-26138 being actively exploited?: Yes. CVE-2022-26138 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-07-29, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2022-26138?: CVE-2022-26138 primarily affects Atlassian Questions For Confluence. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-26138?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2022-26138 have an EU (EUVD) identifier?: Yes. CVE-2022-26138 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2022-30705. It is also flagged as exploited in the EUVD (since 2022-07-29).
When was CVE-2022-26138 published?: CVE-2022-26138 was published on 2022-07-20 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:atlassian:questions_for_confluence:2.7.34:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:questions_for_confluence:2.7.35:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:questions_for_confluence:3.0.2:*:*:*:*:*:*:*

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