Page generated: 10 Nov 2026, 20:53 UTC
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CVE-2021-26086

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint. The affected versions are before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14…

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Affected versions of Atlassian Jira Server and Data Center allow remote attackers to read particular files via a path traversal vulnerability in the /WEB-INF/web.xml endpoint. The affected versions are before version 8.5.14, from version 8.6.0 before 8.13.6, and from version 8.14.0 before 8.16.1.
CVSS 5.3 (MEDIUM) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
1.6/10
REALITY · THREAT PRIORITY
8.3/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 5.3: +0.79
  • 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: 8 documents and public datasets.

Hype components

Headline sample (25%)
50/100
Press, 30 days (60%)
5/100
Grounded branding (15%)
0/100
HYPE TOTAL16/100

Sources and documents

Techzine Global
Press · 07 Oct 2026, 07:00 · Critical Atlassian vulnerability allows attackers to read files - Techzine Global
The Hacker News
Press · 06 Oct 2026, 07:00 · Critical Atlassian Flaw Lets Unauthenticated Attackers Read Known Files Across 8 Products - The Hacker News
Rescana
Press · 06 Oct 2026, 07:00 · Critical CVE-2026-21589 Vulnerability Exposes Atlassian Data Center Products to Unauthenticated File Disclosure - Rescana
Forkast News
Press · 06 Oct 2026, 07:00 · Critical Path Traversal in Atlassian Data Center Exposes Development Infrastructure - Forkast News
CloudSEK
Press · 06 Nov 2024, 08:00 · Mozi Resurfaces as Androxgh0st Botnet: Unraveling The Latest Exploitation Wave - CloudSEK
See all 8 source documents
CloudSEK
Press · 21 Feb 2023, 11:55 · Jira Software Server CVE-2021-26086 Vulnerability Actively Exploited in the Wild - CloudSEK
Recorded Future
Press · 03 Feb 2023, 08:00 · Analyze Recent Atlassian Vulnerabilities and Keep Your Infrastructure Protected - Recorded Future
Rapid7
Press · 02 Sep 2021, 07:00 · Active Exploitation of Confluence Server CVE-2021-26084 - Rapid7

Score evolution

● Hype   ● Reality

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

024681002 Nov 2026 · OBSERVED EXPLOITATION + LOWER RECENT ATTENTIONHype 2.5Reality 8.306 Nov 2026 · OBSERVED EXPLOITATION + LOWER RECENT ATTENTIONHype 1.6Reality 8.3Nov 2Nov 6

━ Hype Score (Perceived)  ━ Reality threat priority. Definition changes are not new attacks.

Public exploit evidence

1

Public exploit entries / repo candidates

Source entries and unverified repository candidates are counted separately.

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 5.3; 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: 2026-11-06 00:12:49.640935+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
16 Aug 2021, 00:15
First press mention
02 Sep 2021, 07:00
Added to the CISA KEV catalog
12 Nov 2024, 00:00
Latest press mention
07 Oct 2026, 07:00
Score calculated
06 Nov 2026, 00:12
PoCs on GitHub
1 repositories