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CVE-2021-26085· NVD / CVE Program· CNA atlassian

Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authorization Arbitrary File

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.

MediumCVSS 5.3 · v3.1KEVWeaponized No fix recorded
Published
Aug 2, 2021
Updated
Jun 16, 2026
EPSS
99.9% · 100th percentile
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Report tools

JSON

Action score

81

Now

Patch today or shut off access.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
30 / 30 · Listed
EPSS
30 / 30 · 99.9%

CISA SSVC decision

Exploitation
active
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Mar 28, 2022. That signals real attacks, not theory.

Remediation deadline for government agencies: Apr 18, 2022.

Known to be used in ransomware campaigns.

Affected systems

VendorProduct
atlassianconfluence data center
atlassianconfluence server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • atlassian confluence data centerbefore 7.4.10
  • atlassian confluence data center7.5.0 and later · before 7.12.3
  • atlassian confluence serverbefore 7.4.10
  • atlassian confluence server7.5.0 and later · before 7.12.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (atlassian). Independent of NVD's CPE analysis and usually ahead of it.

  • Atlassian Confluence Data Center

    • unspecified and later · before 7.4.10affected
    • 7.5.0 and later · before unspecifiedaffected
    • unspecified and later · before 7.12.3affected

  • Atlassian Confluence Server

    • unspecified and later · before 7.4.10affected
    • 7.5.0 and later · before unspecifiedaffected
    • unspecified and later · before 7.12.3affected

Same product

atlassian: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-22527A template injection vulnerability on older versions of Confluence Data Center and Server allows an unauthenticated attacker to achieve RCE KEV
    99Now
  • CVE-2023-22518All versions of Confluence Data Center and Server are affected by this unexploited vulnerability.KEV
    99Now
  • CVE-2023-22515Atlassian has been made aware of an issue reported by a handful of customers where external attackers may have exploited a previously unknowKEV
    99Now
  • CVE-2022-26134In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attackKEV
    99Now
  • CVE-2021-26084In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attackKEV
    99Now
  • CVE-2024-21683This High severity RCE (Remote Code Execution) vulnerability was introduced in version 5.2 of Confluence Data Center and Server.
    61This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Exploit-DB entry ×1
  • Nuclei detection template ×1
  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrywebapps2021-10-05
Nuclei detection templateNuclei template CVE-2021-26085 —
Proof-of-concept repository on GitHubstars:132021-10-05

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+63 d
  3. CISA KEV+237 d
  4. TodaySep 29, 2026+1884 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-425 · Direct Request ('Forced Browsing')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records