How severe is CVE-2017-18111?

CVE-2017-18111 has a CVSS 3.x base score of 8.7, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2017-18111 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-18111?

CVE-2017-18111 affects Atlassian Application Links. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-18111?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-18111 published?

CVE-2017-18111 was published on 2019-03-29 and last updated on 2026-06-17.

CVE-2017-18111

CVE-2017-18111 is a high-severity vulnerability in Atlassian Application Links with a CVSS 3.x base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-611.

Key facts

Severity: High (CVSS 3.x base score 8.7)
CVSS v2: 5.5
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-611
Affected product: Atlassian Application Links
Published: 2019-03-29
Last modified: 2026-06-17

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.

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.
How severe is CVE-2017-18111?: CVE-2017-18111 has a CVSS 3.x base score of 8.7, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2017-18111 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-18111?: CVE-2017-18111 affects Atlassian Application Links. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-18111?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-18111 published?: CVE-2017-18111 was published on 2019-03-29 and last updated on 2026-06-17.

References

https://ecosystem.atlassian.net/browse/APL-1338

Affected products (1)

cpe:2.3:a:atlassian:application_links:*:*:*:*:*:*:*:*

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