CVE-2023-22518: Atlassian Confluence Data Center and Server Improper Authorization Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 7 Nov 2023, 7 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 100%
EPSS score, percentile 100 of all scored records
- How severe?
- 10.0 Critical
CVSS v3.0 base score, given by the CNA
- What should I do?
CISA deadline 28 Nov 2023. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- >= 1.0.0
- >= 1.0.0
Unaffected < 1.0.0; >= 7.19.16; >= 8.3.4; >= 8.4.4; >= 8.5.3; >= 8.6.1; and 6 more
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA due date for this action: 28 November 2023.
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
- https://confluence.atlassian.com/security/cve-2023-22518-improper-authorization-vulnerability-in-confluence-data-center-and-server-1311473907.html
- https://nvd.nist.gov/vuln/detail/CVE-2023-22518
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Unaffected | < 1.0.0 |
| Affected | >= 1.0.0 |
| Unaffected | >= 7.19.16 |
| Unaffected | >= 8.3.4 |
| Unaffected | >= 8.4.4 |
| Unaffected | >= 8.5.3 |
| Unaffected | >= 8.6.1 |
| Status | Versions |
|---|---|
| Unaffected | < 1.0.0 |
| Affected | >= 1.0.0 |
| Unaffected | >= 7.19.16 |
| Unaffected | >= 8.3.4 |
| Unaffected | >= 8.4.4 |
| Unaffected | >= 8.5.3 |
| Unaffected | >= 8.6.1 |
Versions the record lists as unaffected: < 1.0.0, >= 7.19.16, >= 8.3.4, >= 8.4.4, >= 8.5.3, >= 8.6.1.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
Atlassian Confluence Data Center and Server contain an improper authorization vulnerability that can result in significant data loss when exploited by an unauthenticated attacker. There is no impact on confidentiality since the attacker cannot exfiltrate any data.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2023-22518 to its Known Exploited Vulnerabilities (KEV) catalog on 7 Nov 2023.
- CISA marks it as known to be used in ransomware campaigns.
- The due date CISA sets for the required action is 28 Nov 2023.
- The CVE record was published on 31 Oct 2023, 7 days before it was added to KEV.
- The CVE record carries a CVSS v3.0 base score of 10.0 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 100% (percentile 100), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact partial.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
Description
All versions of Confluence Data Center and Server are affected by this unexploited vulnerability. This Improper Authorization vulnerability allows an unauthenticated attacker to reset Confluence and create a Confluence instance administrator account. Using this account, an attacker can then perform all administrative actions that are available to Confluence instance administrator leading to - but not limited to - full loss of confidentiality, integrity and availability. Atlassian Cloud sites are not affected by this vulnerability. If your Confluence site is accessed via an atlassian.net domain, it is hosted by Atlassian and is not vulnerable to this issue.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
- CWE-863: Incorrect Authorization
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 31 Oct 2023 | CVE record published |
| 7 Nov 2023 | Added to CISA KEV |
| 28 Nov 2023 | CISA due date for the required action |
| 21 Oct 2025 | CVE record last updated |
References
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