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CVE-2021-26084

In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version …

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In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5.
CVSS 9.8 (CRITICAL) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
9.0/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 9.8: +1.47
  • Fresh EPSS: 100.00%: +0.50

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 14 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

SentinelOne
Press · 18 Mar 2024, 07:00 · Enterprise Security Essentials | Top 15 Most Routinely Exploited Vulnerabilities 2022 - SentinelOne
www.trendmicro.com
Press · 18 Oct 2021, 07:00 · Tracking CVE-2021-26084 and Other Server-Based Vulnerability Exploits via Trend Micro Cloud One and Trend Micro Vision One - www.trendmicro.com
SOC Prime
Press · 13 Oct 2021, 07:00 · Detecting Atom Silo Ransomware Infections - SOC Prime
The Hacker News
Press · 28 Sep 2021, 07:00 · Atlassian Confluence RCE Flaw Abused in Multiple Cyberattack Campaigns - The Hacker News
thezdi.com
Press · 22 Sep 2021, 07:00 · CVE-2021-26084: Details on the Recently Exploited Atlassian Confluence OGNL Injection Bug - thezdi.com
See all 14 source documents
www.trendmicro.com
Press · 21 Sep 2021, 07:00 · Cryptominer z0Miner Uses Newly Discovered Vulnerability CVE-2021-26084 to Its Advantage - www.trendmicro.com
Akamai
Press · 15 Sep 2021, 07:00 · Akamai Blog | Confluence Server Webwork OGNL Injection (CVE-2021-26084): How Akamai Helps You Protect Against Zero-Day Attacks - Akamai
Palo Alto Networks
Press · 14 Sep 2021, 07:00 · Hunting Confluence Atlassian RCE (CVE-2021-26084) by the Cortex XDR Managed Threat Hunting Experts - Palo Alto Networks
Kaspersky
Press · 06 Sep 2021, 07:00 · CVE-2021-26084: Confluence servers are under attack - Kaspersky
Cyberint
Press · 05 Sep 2021, 07:00 · Atlassian Confluence Server OGNL Injection (CVE-2021-26084) - Cyberint
The Hacker News
Press · 04 Sep 2021, 07:00 · U.S. Cyber Command Warns of Ongoing Attacks Exploiting Atlassian Confluence Flaw - The Hacker News
Rapid7
Press · 02 Sep 2021, 07:00 · Active Exploitation of Confluence Server CVE-2021-26084 - Rapid7
BleepingComputer
Press · 02 Sep 2021, 07:00 · Atlassian Confluence flaw actively exploited to install cryptominers - BleepingComputer
TechTarget
Press · 01 Sep 2021, 07:00 · Atlassian Confluence flaw under active attack - TechTarget

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 9.0 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

7

Public exploit entries / repo candidates

See 7 repos with metrics
RepositoryStarsForksLanguageUpdated
sma11new/PocList17737Python21 Nov 2021, 10:34
alt3kx/CVE-2021-26084_PoC5316—01 Sep 2021, 01:01
ZZ-SOCMAP/CVE-2021-2608492Python14 Jan 2022, 04:21
ludy-dev/CVE-2021-26084_PoC31Python21 Sep 2021, 08:33
bcdannyboy/CVE-2021-26084_GoPOC10Go01 Sep 2021, 16:18
GlennPegden2/cve-2021-26084-confluence11Python07 Sep 2021, 15:09
wolf1892/confluence-rce-poc01—04 Sep 2021, 15:16
Public exploit evidence
Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 9.8; EPSS 100.0%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, no user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:24.835925+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
30 Aug 2021, 06:30
First press mention
01 Sep 2021, 07:00
Added to the CISA KEV catalog
03 Nov 2021, 00:00
Latest press mention
18 Mar 2024, 07:00
Score calculated
05 Nov 2026, 13:58
PoCs on GitHub
7 repositories