VulnerabilityPublished 19 Jun 2023Updated 27 May 2025

CVE-2023-32208: Mozilla Firefox · Leak of script base URL in service workers via import()

Affects Mozilla FirefoxSource CVE Database V5

Not known to be exploited : upgrade to 113 when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated Medium by the CNA (mozilla) · No CVSS score from NVD or the CNA

EPSS: 0.5% chance of exploitation in 30 days – higher than 44% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 113

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Jun 2023
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade the Debian debian/firefox package to 113.

Affected software

Product	Affected	Fixed in
Debiandebian/firefox`pkg:deb/debian/firefox`Other threats	Affected <113	Fixed in 113

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AI-suggested

European organizations should ensure that all Firefox installations are updated to version 113 or later, where this vulnerability is addressed. IT departments should audit their browser deployment policies to enforce timely updates, especially for users accessing sensitive or critical web applications. Additionally, web developers should review their use of service workers and dynamic imports to minimize exposure of sensitive URLs. Implementing Content Security Policy (CSP) headers can help restrict the sources from which scripts can be loaded, reducing the risk of malicious exploitation. Organizations should also monitor network traffic for unusual requests that might indicate reconnaissance attempts. Finally, educating users about phishing and social engineering risks remains important, as attackers may use leaked information to craft convincing attacks.

Description

Service workers could reveal script base URL due to dynamic `import()`. This vulnerability affects Firefox < 113.

Impact

For European organizations, the impact of this vulnerability primarily lies in the potential exposure of internal web application structure and resource locations. Organizations relying on Firefox browsers for accessing sensitive web applications that utilize service workers and dynamic imports could have their internal URLs exposed to malicious actors. This information leakage can facilitate more sophisticated attacks by providing attackers with insights into the web application's architecture, potentially increasing the risk of targeted phishing campaigns or exploitation of other vulnerabilities. While the vulnerability itself does not directly compromise confidentiality, integrity, or availability, it lowers the barrier for attackers to conduct further attacks. Organizations in sectors with high reliance on web applications and sensitive data, such as finance, healthcare, and government, may be more at risk if attackers leverage this information leakage to craft targeted exploits. However, since no known exploits are currently active, the immediate risk is moderate but should not be ignored.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Jul 2025, 02:57 UTC

Technical details

References

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