Skip to content
Noroxi
NVD / CVE Program· CNA atlassian

CVE-2021-26085: Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authorization Arbitrary File…

MediumCVSS 5.3 · v3.1KEVWeaponized No fix recorded

Noroxi assessment

Priority: Now (action score 81/100)

  • CISA has confirmed exploitation in the wild (Mar 28, 2022); it is known to be used in ransomware campaigns. Remediation deadline for US federal agencies: Apr 18, 2022.
  • A ready-made attack module is public (Nuclei); exploiting it takes no special expertise.
  • Probability of exploitation in the next 30 days: 99.9% (FIRST EPSS); higher than 99.9% of all records.
  • 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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • According to the record, no fixed version is available yet.

Patch today or shut off access. Until a fix is released, restrict access to the affected component and follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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.

Published
Aug 2, 2021
Updated
Jun 16, 2026
EPSS
99.9% · 99th percentile

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 US federal agencies: Apr 18, 2022.

Known to be used in ransomware campaigns.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-26085

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits every 10 minutes on paid plans, on the hour on the free plan.

Your free account also gets you

  • CVE alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools, at most 30 a day (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for atlassian records
Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
atlassianconfluence data center
atlassianconfluence server

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
Affected versions · NVD (4)

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

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…KEV
    99Now

Published before and after this one in the same product

  • ← EarlierCVE-2021-26072Apr 1, 2021 · The WidgetConnector plugin in Confluence Server and Confluence Data Center before version 5.8.6 allowed remote attackers to manipulate the…
    29Monitor
  • ← EarlierCVE-2020-29444May 7, 2021 · Affected versions of Team Calendar in Confluence Server before 7.11.0 allow attackers to inject arbitrary HTML or Javascript via a Cross…
    21Monitor
  • Later →CVE-2021-26084Aug 30, 2021 · In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated…KEV
    99Now

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. TodayNov 14, 2026+1929 d

Bug bounty scope

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

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate.

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.

References

Show all references (1 more)

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

All records