VulnerabilityPublished 24 Oct 2023Updated 18 Dec 2025

CVE-2023-5732: Mozilla Firefox

Affects Mozilla FirefoxSource CVE Database V5

Not known to be exploited · fixed in 117 : update Mozilla Firefox when convenient.

Data as of 26 Oct 2026, 10:12 UTC

Severity

Medium

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

EPSS: 1.0% chance of exploitation in 30 days – higher than 64% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 117, 115.4.1, 115.4

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Oct 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 Mozilla Firefox to 117, 115.4.1 or 115.4.

Affected software

Product	Affected	Fixed in
Mozilla Firefox	Affected <117 <115.4 <115.4.1	Fixed in 117 115.4 115.4.1

AI-suggested

Mozilla has released official fixes for this vulnerability in Firefox 117, Firefox ESR 115.4, and Thunderbird 115.4.1. Users and administrators should update to these versions or later to remediate this issue. Since the vulnerability is fixed in these releases, no additional mitigation steps are required.

Description

CVE-2023-5732 is a vulnerability in Mozilla Firefox and Thunderbird that allows an attacker to spoof the address bar location by using bidirectional characters in a malicious link. This spoofing could mislead users about the actual URL they are visiting. The vulnerability affects Firefox versions prior to 117, Firefox ESR versions prior to 115.4, and Thunderbird versions prior to 115.4.1. Mozilla has fixed this issue in Firefox 117, Firefox ESR 115.4, and Thunderbird 115.4.1. The impact is considered moderate, and no known exploits in the wild have been reported.

Impact

The vulnerability allows an attacker to spoof the URL displayed in the address bar by exploiting bidirectional character rendering. This could lead to user deception, potentially facilitating phishing or social engineering attacks. However, the impact is limited to visual spoofing and does not indicate direct code execution or data compromise. No known exploitation in the wild has been reported.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Oct 2026, 21:28 UTC

Technical details

References

Community reviews

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