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No exploitation reportedFix available

CVE-2017-18111

No exploitation reported by the sources we read.

  • Published2019-03-29
  • Fixed in5.2.6 · 5.1.3 · 5.0.10
  • WeaknessCWE-611

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The OAuthHelper in Atlassian Application Links before version 5.0.10, from version 5.1.0 before version 5.1.3, and from version 5.2.0 before version 5.2.6 used an XML document builder that was vulnerable to XXE when consuming a client OAuth request. This allowed malicious oauth application linked applications to probe internal network resources by requesting internal locations, read the contents of files and also cause an out of memory exception affecting availability via an XML External Entity vulnerability.

Timeline

dates in UTC
  1. 2019-03-2914:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-18111?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-18111?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Atlassian application links
BranchAffectedFixed in
5.2≥ 5.2.0, < 5.2.65.2.6
5.1≥ 5.1.0, < 5.1.35.1.3
5.0< 5.0.105.0.10

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Atlassian application links to 5.2.6 · 5.1.3 · 5.0.10

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.08.7read 2026-10-23
  • NVDCVSS 2.05.5read 2026-10-23
  • NVDweakness (CWE)CWE-611read 2026-10-23
  • FIRST EPSSEPSS score1.6 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:H
Published
2019-03-29
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2017-18111?

The OAuthHelper in Atlassian Application Links before version 5.0.10, from version 5.1.0 before version 5.1.3, and from version 5.2.0 before version 5.2.6 used an XML document builder that was vulnerable to XXE when consuming a client OAuth request. This allowed malicious oauth application linked applications to probe internal network resources by requesting internal locations, read the contents of files and also cause an out of memory exception affecting availability via an XML External Entity vulnerability.

Is CVE-2017-18111 actively exploited?

Active exploitation of CVE-2017-18111 has not been confirmed. Its EPSS score was 1.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-18111?

CVE-2017-18111 has a CVSS v3 base score of 8.7 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:H.

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