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CVE-2021-26085

Exploited in the wild. In CISA KEV since 2022‑03‑28. Fixed versions are out.

CVSS 3.15.3MediumEPSS percentile99th100% chance in 30 daysCISA KEVListedsince 2022-03-28, due 2022-04-18
Public exploit: 1 sourceFix2 products3 fixed builds listed below

Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Atlassian Confluence Data CenterAffected: ≥ unspecified, < 7.4.10Upgrade to: 7.4.10Affected: ≥ 7.5.0, < unspecifiedUpgrade to: unspecifiedAffected: ≥ unspecified, < 7.12.3Upgrade to: 7.12.3Stated by: CVE record
  • Atlassian Confluence ServerAffected: < 7.4.10Upgrade to: 7.4.10Stated by: NVD

Versions as the sources state them. Full version matrix after sign-in

Check it yourselfA free Nuclei and OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Discuss checks for your systems with a specialist. Scope is agreed before testing.

Coverage timeline

0 publishers

  1. Added to CISA KEV catalog

    ·CISA KEV

Sourced from public security reporting — each date is when it was published, not when it happened.

What it is

From the CVE record

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.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS99th
Public exploit
CISA KEV
CISA KEV

Listed as exploited in the wild since 2022-03-28.

US federal agencies must remediate by 2022-04-18.

Known use in ransomware campaigns.

Apply updates per vendor instructions.
Public exploits

1 source with a proof of concept or module.

Exploit links, PoCs and Metasploit modules after sign-in
EPSS

100% chance of exploitation activity in the next 30 days, which ranks it in the 99th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

The patch came 133 days before any public exploit.

  1. OpenVAS check added
  2. Public exploit / PoCsource: packetstormnuclei check added
  3. Patch availablerecord updated
  4. Added to CISA KEVransomware campaign
  5. Publishedweakness classified, att&ck mapped

Affected products

And 2 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 5.3 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality LowSome restricted information is disclosed, but limited in scope
  • Integrity NoneNo integrity impact
  • Availability NoneNo availability impact

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 3 more references. See all after sign-in

Watch the software you run.

My Stack ranks new CVEs for your products by real-world exploitation, so the next exploited one reaches you without reading every advisory.

We'll flag the next CVE, public exploit or patch for Confluence Server, not every advisory. This one: actively exploited.