How severe is CVE-2018-5123?

CVE-2018-5123 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-5123 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-5123?

CVE-2018-5123 affects Mozilla Bugzilla. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-5123?

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-2018-5123 published?

CVE-2018-5123 was published on 2019-04-29 and last updated on 2026-06-17.

CVE-2018-5123

CVE-2018-5123 is a high-severity vulnerability in Mozilla Bugzilla with a CVSS 3.x base score of 8.8. 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-352.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (39th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Mozilla Bugzilla
Published: 2019-04-29
Last modified: 2026-06-17

Description

A third party website can access information available to a user with access to a restricted bug entry using the image generation in report.cgi in all Bugzilla versions prior to 4.4.

Frequently asked questions

What is CVE-2018-5123?: A third party website can access information available to a user with access to a restricted bug entry using the image generation in report.cgi in all Bugzilla versions prior to 4.4.
How severe is CVE-2018-5123?: CVE-2018-5123 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-5123 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-5123?: CVE-2018-5123 affects Mozilla Bugzilla. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-5123?: 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-2018-5123 published?: CVE-2018-5123 was published on 2019-04-29 and last updated on 2026-06-17.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2018-5123

Affected products (1)

cpe:2.3:a:mozilla:bugzilla:*:*:*:*:*:*:*:*

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