CVE-2021-26085
Confirmed PUBLISHEDAffected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authorization Arbitrary File Read...
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authorization Arbitrary File Read vulnerability in the /s/ endpoint. The affected versions are before version 7.4.10, and from version 7.5.0 before 7.12.3.
- CVE Published
- Aug 03, 2021
- Exploitation Reported
- Mar 28, 2022
- CVSS
- 5.3 Medium
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Atlassian |
Confluence Server
|
unspecified to < 7.4.10 |
Affected |
| Atlassian |
Confluence Server
|
7.5.0 to < unspecified |
Affected |
| Atlassian |
Confluence Server
|
unspecified to < 7.12.3 |
Affected |
| Atlassian |
Confluence Data Center
|
unspecified to < 7.4.10 |
Affected |
| Atlassian |
Confluence Data Center
|
7.5.0 to < unspecified |
Affected |
| Atlassian |
Confluence Data Center
|
unspecified to < 7.12.3 |
Affected |
CVE References
- jira.atlassian.com/browse/CONFSERVER-67893 jira.atlassian.com · CVE Record https://jira.atlassian.com/browse/CONFSERVER-67893
- packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/164401/Atlassian-Confluence-Serv...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2022-03-28 00:00 UTC |
Scanner Artifacts
Nuclei and Metasploit references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-26085.yaml | Apr 25, 2025 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
AV:N/AC:L/Au:N/C:P/I:N/A:N
Exploitation Status
Exploited in the wild
Recorded 2022-03-28 00:00:00 UTC · CISA
Used in malware
Recorded 2022-03-28 00:00:00 UTC · CISA
Proof of concept available
Recorded 2021-10-05 08:20:25 UTC · GitHub
Weaknesses (CWE)
-
Direct Request ('Forced Browsing')
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-26085.yaml | Apr 25, 2025 |
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2021-10-05 08:20:25 UTC · 14 stars
Atlassian Confluence Server 7.5.1 Pre-Authorization Arbitrary File Read vulnerability (CVE-2021-26085)
nuclei · Created Unknown
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC about 1 year ago00:00 UTC · about 1 year ago
Nuclei template available
Scanner coverage available
-
00:00 UTC over 4 years ago00:00 UTC · over 4 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
00:00 UTC over 4 years ago00:00 UTC · over 4 years ago
First public exploitation report
Exploit observed in malware
-
08:20 UTC almost 5 years ago08:20 UTC · almost 5 years ago
Public PoC available
Public proof-of-concept code published
-
00:00 UTC almost 5 years ago00:00 UTC · almost 5 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC over 5 years ago00:00 UTC · over 5 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2021-26085
{
"cve_id": "CVE-2021-26085",
"title": "Affected versions of Atlassian Confluence Server allow remote attackers to vi...",
"affected_vendor": "Atlassian",
"affected_product": "Confluence Server, Confluence Data Center",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 5.3,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}