Common Weakness Enumeration
CWE-340
Allowed-with-ReviewGeneration of Predictable Numbers or Identifiers
Abstraction: Class · Status: Incomplete
The product uses a scheme that generates numbers or identifiers that are more predictable than required.
72 vulnerabilities reference this CWE, most recent first.
CVE-2026-56016 (GCVE-0-2026-56016)
Vulnerability from cvelistv5 – Published: 2026-07-01 06:46 – Updated: 2026-07-01 17:36
VLAI
EPSS
VEX
Title
CGI::Session::ID::md5 versions before 4.49 for Perl generate predictable session ids from low-entropy sources
Summary
CGI::Session::ID::md5 versions before 4.49 for Perl generate predictable session ids from low-entropy sources.
The generate_id method builds the session id from a MD5 digest of the process id, the epoch time, and the built-in rand() function. All three are predictable, low-entropy sources: the PID is drawn from a small range, the epoch time can be guessed or read from the HTTP Date header, and Perl's rand() is unsuitable for security purposes because it is predictable and reversible.
An attacker who predicts a session id can impersonate the corresponding session and bypass authentication.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MARKSTOS | CGI::Session::ID::md5 |
Affected:
0 , < 4.49
(custom)
|
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CVE-2026-47085 (GCVE-0-2026-47085)
Vulnerability from cvelistv5 – Published: 2026-07-16 00:00 – Updated: 2026-07-16 18:54
VLAI
EPSS
VEX
Summary
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. URLAUTH token forgery can occur via a missing mboxkey. If an attacker knew a folder name on the victim's account for which the victim had never issued an auth URL, they could forge a working URLAUTH token by computing an HMAC-SHA1 value with a predictable key, giving them read access to the mailbox. (URLAUTH is an obscure feature, meaning that the odds of any user actually being susceptible to this attack are very low. Perhaps no public clients use URLAUTH.)
Severity
4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-340 - Generation of Predictable Numbers or Identifiers
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| cyrusimap | Cyrus IMAP |
Affected:
0 , < 3.12.3
(semver)
|
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CVE-2026-45673 (GCVE-0-2026-45673)
Vulnerability from cvelistv5 – Published: 2026-06-12 14:16 – Updated: 2026-06-12 16:05
VLAI
EPSS
VEX
Title
Netty: DNS Cache Poisoning due to Predictable PRNG and Default Static Source Port
Summary
Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's DNS resolver uses a predictable PRNG for generating DNS transaction IDs and defaults to a static UDP source port. This combination reduces the entropy of DNS queries, enabling DNS Cache Poisoning (Kaminsky attack). Versions 4.1.135.Final and 4.2.15.Final patch the issue.
Severity
6.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/netty/netty/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/netty/netty/releases/tag/netty… | x_refsource_MISC |
| https://github.com/netty/netty/releases/tag/netty… | x_refsource_MISC |
Impacted products
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CVE-2026-42932 (GCVE-0-2026-42932)
Vulnerability from cvelistv5 – Published: 2026-06-12 18:17 – Updated: 2026-06-12 19:00
VLAI
EPSS
VEX
Title
Naxclow IoT Platform Generation of Predictable Numbers or Identifiers
Summary
Naxclow device identifiers use fixed manufacturing prefixes combined with sequential counters, producing a fully predictable and enumerable identifier space. Because the platform also exposes an endpoint that reveals the current identifier high-water mark, the active fleet can be enumerated.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-340 - Generation of Predictable Numbers or Identifiers
Assigner
References
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| Naxclow | Smart Doorbell X3 |
Affected:
All
|
|
| Naxclow | X Smart Home |
Affected:
All
|
|
| Naxclow | V720 |
Affected:
All
|
|
| Naxclow | ix cam |
Affected:
All
|
Date Public
2026-06-11 15:52
Credits
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CVE-2026-40496 (GCVE-0-2026-40496)
Vulnerability from cvelistv5 – Published: 2026-04-21 01:38 – Updated: 2026-04-21 13:50
VLAI
EPSS
VEX
Title
FreeScout has Predictable Attachment Token that Allows Unauthenticated Private File Download via Brute Force
Summary
FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, attachment download tokens are generated using a weak and predictable formula: `md5(APP_KEY + attachment_id + size)`. Since attachment_id is sequential and size can be brute-forced in a small range, an unauthenticated attacker can forge valid tokens and download any private attachment without credentials. Version 1.8.213 fixes the issue.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/freescout-help-desk/freescout/… | x_refsource_CONFIRM |
| https://github.com/freescout-help-desk/freescout/… | x_refsource_MISC |
| https://github.com/freescout-help-desk/freescout/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| freescout-help-desk | freescout |
Affected:
< 1.8.213
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CVE-2026-28810 (GCVE-0-2026-28810)
Vulnerability from cvelistv5 – Published: 2026-04-07 07:50 – Updated: 2026-07-24 14:16
VLAI
EPSS
VEX
Title
Predictable DNS Transaction IDs Enable Cache Poisoning in Built-in Resolver
Summary
Generation of Predictable Numbers or Identifiers vulnerability in Erlang/OTP kernel (inet_res, inet_db modules) allows DNS Cache Poisoning.
The built-in DNS resolver (inet_res) uses a sequential, process-global 16-bit transaction ID for UDP queries and does not implement source port randomization. Response validation relies almost entirely on this ID, making DNS cache poisoning practical for an attacker who can observe one query or predict the next ID. This conflicts with RFC 5452 recommendations for mitigating forged DNS answers.
inet_res is intended for use in trusted network environments and with trusted recursive resolvers. Earlier documentation did not clearly state this deployment assumption, which could lead users to deploy the resolver in environments where spoofed DNS responses are possible.
This vulnerability is associated with program files lib/kernel/src/inet_db.erl and lib/kernel/src/inet_res.erl.
This issue affects OTP from OTP 17.0 before OTP 28.4.2, OTP 27.3.4.10 and OTP 26.2.5.19, corresponding to kernel from 3.0 before 10.6.2, 10.2.7.4 and 9.2.4.11.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-340 - Generation of Predictable Numbers or Identifiers
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/erlang/otp/security/advisories… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-28810.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-28810 | related |
| https://www.erlang.org/doc/system/versions.html#o… | x_version-scheme |
| https://github.com/erlang/otp/commit/36f23c9d2cc5… | patch |
| https://github.com/erlang/otp/commit/dd15e8eb0354… | patch |
| https://github.com/erlang/otp/commit/b057a9d99501… | patch |
Impacted products
Credits
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CVE-2026-13577 (GCVE-0-2026-13577)
Vulnerability from cvelistv5 – Published: 2026-07-20 07:11 – Updated: 2026-07-22 12:00
VLAI
EPSS
VEX
Title
Dancer2 versions through 2.1.0 for Perl generate insecure session ids when required CSPRNG modules are unavailable
Summary
Dancer2 versions through 2.1.0 for Perl generate insecure session ids when required CSPRNG modules are unavailable.
Dancer2::Core::Role::SessionFactory::generate_id silently falls back to a built-in rand-derived session id unless both Math::Random::ISAAC::XS and Crypt::URandom are available.
The fallback session id is generated from a SHA-1 hash of a call to the built-in rand function, the absolute path of the Dancer2::Core::Role::SessionFactory module, an internal counter, the process id, the module instance memory address, and a shuffled string of characters (using the List::Util::shuffle function, which also uses the built-in rand function).
These are all low-entropy and easily guessed sources.
The built-in rand() function is seeded with 32-bits and considered unsuitable for security applications.
Predictable session ids could allow an attacker to gain access to systems.
Severity
8.2 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
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CVE-2026-11374 (GCVE-0-2026-11374)
Vulnerability from cvelistv5 – Published: 2026-06-23 08:19 – Updated: 2026-06-24 15:48
VLAI
EPSS
VEX
Title
Account Takeover via Predictable SSO Ticket Generation
Summary
In ManageEngine ADSelfService Plus, RecoveryManager Plus, M365 Manager Plus, and ADAudit Plus, the SSO tickets generated to authenticate that session could be predicted
by an unauthenticated user, leading to account takeover.
Severity
9 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| zohocorp | manageengine_adselfservice_plus |
Affected:
0 , < 6529
(custom)
|
|
| zohocorp | manageengine_recovery_manager_plus |
Affected:
0 , < 6321
(custom)
|
|
| zohocorp | manageengine_m365_manager_plus |
Affected:
0 , < 4817
(custom)
|
|
| zohocorp | manageengine_adaudit_plus |
Affected:
0 , < 8703
(custom)
|
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CVE-2026-9733 (GCVE-0-2026-9733)
Vulnerability from cvelistv5 – Published: 2026-06-23 07:05 – Updated: 2026-06-23 14:18
VLAI
EPSS
VEX
Title
Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter
Summary
Mojolicious::Plugin::Web::Auth::OAuth2 versions through 0.17 for Perl have an insecure default state parameter.
When no state generator is specified in the constructor, the module defaults to using a SHA-1 hash of predictable and low-entropy sources, including the epoch time (which is leaked via the HTTP Date header) and a call to Perl's built-in rand function.
A predictable state allows an attacker to hijack another user's session through cross site request forgery (CSRF).
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
4 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| HAYAJO | Mojolicious::Plugin::Web::Auth::OAuth2 |
Affected:
0 , ≤ 0.17
(custom)
|
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CVE-2026-9692 (GCVE-0-2026-9692)
Vulnerability from cvelistv5 – Published: 2026-06-18 17:53 – Updated: 2026-06-18 18:47
VLAI
EPSS
VEX
Title
Mojolicious::Sessions::Storable versions through 0.05 for Perl generate session ids insecurely
Summary
Mojolicious::Sessions::Storable versions through 0.05 for Perl generate session ids insecurely.
The default session id generator returns a SHA-1 hash seeded with the built-in rand function, the epoch time, the heap address of an anonymous hash, and the PID.
These are predictable or low-entropy sources that are unsuitable for security purposes.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://security.metacpan.org/patches/M/Mojolicio… | patch |
| https://metacpan.org/release/HAYAJO/Mojolicious-P… | |
| https://www.cve.org/CVERecord?id=CVE-2025-40923 | vendor-advisoryrelatedvdb-entry |
| https://security.metacpan.org/docs/guides/random-… | technical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| HAYAJO | Mojolicious::Sessions::Storable |
Affected:
0 , ≤ 0.05
(custom)
|
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No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.