CVE-2019-12490Network attack vector

Confidentiality disclosure via reverse tabnabbing

Published Jan 22, 2020 · Updated Aug 4, 2024

Reverse tabnabbing in Simple Machines Forum before 2.0.16 allows remote attackers to disclose page content through crafted external links. External links opened with target="_blank" leave the originating page available to the linked page through the browser opener relationship, allowing replacement of the original page with attacker-controlled content. Exploitation requires a forum user to activate an external link, and the demonstrated consequence is deceptive page replacement or indirect disclosure rather than server-side code execution.

CVSS severity6.5
Medium
EPSS probability1.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reverse tabnabbing in Simple Machines Forum before 2.0.16 allows remote attackers to disclose page content through crafted external links. External links opened with target="_blank" leave the originating page available to the linked page through the browser opener relationship, allowing replacement of the original page with attacker-controlled content. Exploitation requires a forum user to activate an external link, and the demonstrated consequence is deceptive page replacement or indirect disclosure rather than server-side code execution.

The record

CVE
CVE-2019-12490
Published
Jan 22, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 22, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
4.3NVDAV:N/AC:M/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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